Answer:
In chemistry, the molar mass M is a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by the amount of substance. The base SI unit for molar mass is kg/mol. However, for historical reasons, molar masses are almost always expressed in g/mol.
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B. Radioactive Isotopes last for less time
C. Radioactive isotopes last longer.
D. There is no difference
Radioactive isotopes last for less time, is the one among the following choices given in the question that shows the way a radioactive isotope and a stable isotope differs
B. Quartzite is not granular, while sandstone is granular.
C. Quartz sandstone has undergone metamorphism, while quartzite has not.
D. A broken piece of quartzite will break through, not around, quartz sand grains.
D. A broken piece of quartzite will break through, not around, quartz sand grains.
Quartzite and quartz sandstone have the same chemical formula (SiO_2)
Quartzite is a metamorphic rock. Heat and pressure have compressed the sand into a strong network of interlocking quartz grains.
Quartzite is so tough that it breaks through the sand grains rather than around them as in sandstone.
Answer:
D. A broken piece of quartzite will break through, not around, quartz sand grains
Explanation:
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When the sun shines equally on both hemispheres, it is called the equinox.
An equinox is defined as an event in which a planet’s subsolar point passes through the Equator. The equinoxes are the time when both the Northern and Southern Hemispheres experience equal amounts of daytime and nighttime.
There are two equinoxes that take place in a year - the spring equinox and the autumn equinox. During these times, the Earth's axis is not tilted towards or away from the sun which results in equal amounts of daylight and darkness in both the Northern and Southern Hemispheres. The spring equinox marks the beginning of spring season in the Northern Hemisphere, while the autumn equinox marks the beginning of autumn in the Southern Hemisphere.
Thus, when the sun shines equally on both hemispheres, it is called the equinox.
Learn more about equinox,here:
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(2) electrical energy to nuclear energy
(3) chemical energy to electrical energy
(4) chemical energy to nuclear energy
Answer: 1) electrical energy to chemical energy
Explanation: The reaction must be forced by applying an external electric current thus needing a supply of electric current.